So, how much memeory does OS X need to run smoothly and quickly? Is 1GB enough fr normal things or is 2GB needed?

1 GB should be fine....

Something I always keep in mind, is that most people who may download a program or two from the net. Will eventually download programs that will have memory leaks. This includes mainstream products like Firefox, Entourage etc.

Then again most people who use computers don't even know what a memory leak is or how to check for one.

Basically I like having my computer maxed out if possible...that way I know I can do what I want with less restriction in the future.

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